Surah An-Nur 24:53

۞ وَأَقْسَمُوا۟ بِٱللَّهِ جَهْدَ أَيْمَـٰنِهِمْ لَئِنْ أَمَرْتَهُمْ لَيَخْرُجُنَّ ۖ قُل لَّا تُقْسِمُوا۟ ۖ طَاعَةٌ مَّعْرُوفَةٌ ۚ إِنَّ ٱللَّهَ خَبِيرٌۢ بِمَا تَعْمَلُونَ

And they swear by Allāh their strongest oaths that if you ordered them, they would go forth [in Allāh's cause]. Say, "Do not swear. [Such] obedience is known. Indeed, Allāh is [fully] Aware of that which you do."

Translation: Saheeh International

Tafsir

And they swear by God solemn oaths that if you order them to participate in the struggle they will surely go forth. Say to them ‘Do not swear! Acknowledged obedience to the Prophet is better than the oaths to which you are not true. Surely God is Aware of what you do’ when you say you will obey but act otherwise.

Excerpt from Tafsir al-Jalalayn, commentary on 24:53, via Quran.com. The reader has the full commentary and 9 more tafsirs.